class Tryouts

def self.parse_file(fpath)
  raise "No such file: #{fpath}" unless File.exists?(fpath)
  file_content = File.read(fpath)
  to = Tryouts.new
  begin
    to.paths << fpath
    to.instance_eval file_content, fpath
    # After parsing the DSL, we'll know the group name.
    # If a Tryouts object already exists for that group
    # we'll use that instead and re-parse the DSL. 
    if @@instances.has_key? to.group
      to = @@instances[to.group]
      to.instance_eval file_content, fpath
    end
  rescue SyntaxError, LoadError, Exception, TypeError,
         RuntimeError, NoMethodError, NameError => ex
    to.errors << ex
    Tryouts.failed = true
    # It's helpful to display the group name
    file_content.match(/^group (.+?)$/) do |x,t|
      # We use eval as a quick cheat so we don't have
      # to parse all the various kinds of quotes.
      to.group = eval x.captures.first
    end
  end
  @@instances[to.group] = to
  to
end